Improvement in ventilators



P. MIHAN.

VENTILATOR.

.Nb.186,o54. Patented Jan. 9, 1877.

N,PETERS, PHOTO-LITHOGNAPHER, WASHINGTON, D C- UNITED STATES PATRICKMIHAN, OF OAMBRIDGEPORT, MASSACHUSETTS.

IMPROVEMENT IN VENTILATORS.

Specification forming part of Letters Patent No. 186,054, dated January9, 1877 application filed March 28, 1876.

To all whom it mag concern:

Be it known that I, PATRICK MIHAN, of Oambridgeport, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Ventilators; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which 1 willenable others skilled in the art to which it bining both the principleof exhaust and supply-0ne portion serving to eject the foul or impureair, and the other to inject or supply fresh or pure air to the buildingor apartment to be ventilated.

I am aware that the principle of constructing a ventilator, so as toperform the double function of aiding in withdrawing the foul air from abuilding, and supplying the latter with pure or fresh air is not new,and therefore I make no claim to such in the abstract, my inventionconsisting in the peculiar construction, combination, and arrangement ofthe parts of a ventilator, involving such principle as hereinafterdescribed and claimed.

In the accompanying drawing, A denotes the foul-air pipe, which is of acylindrical shape, arranged centrally, and extends through the body ofthe ventilator, and terminates at a short distance below the cap or domeB. O is another cylindrical pipe, which surrounds the pipe A, is open attop, and terminates at a distance below the upper end of the pipe A. Thepipe 0 terminates at its lower end in an angular enlargement, a, whichis closed and connected with the exterior of the pipe A, the object ofsuch enlargement being to enable a series of connecting tubes or ports,b b, to be conveniently formed thereon to connect with pipes leading tothe different rooms of a building. The space between the cylinders orpipes A and O constitutes an air-chamber, 0, for the supply of pure airto the room or rooms. 0 c are two perforated annular diaphragms orstays, which are disposed between the pipes A and O, and are soldered orotherwise suitably secured thereto, the same serving to maintain theparts in their relative positions, and at the same time time allowcurrents of air to freely pass down through the same. D D are two conicfrusta, which are united at their greater bases, the frustum D beingperforated around its periphery or outer surface with two annular seriesof holes or air-inducts d d. The lower part of the frustum D impingesagainst the exterior surface of the pipe (3, and is connected therewithby soldering or otherwise. The top of the frustum D is of a somewhatlarger diameter than the pipe A, and terminates at a short distancebelow the upper end of the same. Within the frusta D and D is disposedanother frustum, E, whose upper end impinges against the pipe A, and issecured thereto by soldering, or in other suitable manner, the base ofsuch latter frustum resting upon the frustum D, and midway between itstwo series of air-inlets d d, before mentioned. By this arrangement ofthe frustum E, within the frusta D and D, it will at once be evidentthat the currents of air entering the outer series d of inlets will becaused to pass up directly around the superior end of the foulair pipe,and thereby aid in the discharge of the foul air from such pipe, whilethe currents entering the inner series (1 of inlets, and into the spacebetween the frustum E and the pipe A, will be deflected downward by thefrustum E into the mouth of the air-chamber 0 or space between the pipesA and G. The cap or dome B is supported upon rods extending up from thefrustum D through the frustum D, and secured thereto and to the cap inany suitable manner.

The base of my improved ventilator is intended to be arranged in theattic or upper part of a building. The pipe A is to be connected withany suitable foul-air pipe or foulair chamber. Suitable pipes are to beapplied to the ports in the lower part of the air-supply chamber 0, toextend down to any desirable room or rooms in the structure, and so asto enter such rooms at any desirable point or circumscribin gair-induction chamber 0, closed at bottom, and provided with .one ormore pipe-connectors, b, as and for the purpose set forth.

In testimony that I claim the foregoing as my own invention I aflix mysignaturein presence of two witnesses.

PATRICK MIHAN.

Witnesses:

F. P. HALE, F. O. HALE.

